Rock-drill chuck.



tron A I CHARLES A; Humanism; or. LOS enennns, canirozanief ROCK-DRILL CHUCK.

To all whom it may concern:

Be it known that I,' Ci-IAnLns A. Homi- 'UIs'r, a citizen of the United States, resid-.

ing at Los Angeles, in the county of Los Angeles and State of California, have in vented a new and usefulRock Drill Chuck, I

of which the following is a specification.

This invention relates to devices ofthe character designedto hold a tool such as a drill-bit or the like, and an object of the invention is to provide a construction in which the fastening parts will be maintained in perfect condition so that they can be used over and over againwithout repairing thereoifand so that the drill-bit will be held with maximum security.

Another object is to make provision in I this class of devices employing akey, wedge and U-bolt construction for preventing the U-bolt from being bent when the wedge is driven in.

Ordinarily in this class of devices having the U-bolt fastening, the intermediate portion of the U bolt is spaced apart from the key to receive the wedge, and said intermediate portion together with the adjacent portions of the legs of the U-bolt project a considerable distance out of the holes in which the U-bolt is accommodated, so that, when the wedge is driven in, the intermediate portion and adjacent portions of the legs of the'U-bolt are forcibly bent in the direction in which the wedge is driven in. This makes itadvisable to straighten the U-bolt before it is used the next time, and it is read ily seen that such straightening consumes the prevention of bending ofthe U-bolt by time and is also more or less detrimental to the strength of the Ubolt. When the U- bolt bends the wedge cannot be as tightly driven in place as when the U-bolt is pre vented from bending. v I

Another object is to make provision for a simple andefiicient construction.

The accompanying drawings illustrate the invention.

Figure 1 is a side elevation of a device embodying the inventiomthe drill-bit being shown in place. Fig. 2 is an enlarged tragmentary view mainly in section on line in dicated by m w Fig. 1; Fig. 3 is 'a transverse section on line indicated by m a2 Fig. 2, a portion of the U-bolt beingbroken away for clearness of illustration.

There 1s provided a chuck member comfrom the bolt holes 12.

Specification of Letters Patent. i DQQ Zfi; 1916, Application fi led August 12,1916. Serial at. 114,561.

with annular grooveset for retention ofthe devicein an operating 110 1, not shown, such,

for instance, as a pneumatically operated drilling engine. The socket member 3 is provided with" a socket 5 and in said socket. is seated a bushing 6 adapted to rece ve the end of a drill bit 7 or other tool. y 1

The socket member .3 and bushing 6 are provided with key. slots 8, 9 respectively to accommodate akey 10. having a curved seat 11.to engage the periphery of the drill-bit 7. The key 10,"as is wellu'nderstood, prevents longitudinal and rotative movements of the drill-bit 7 relative to the. socket mem ber sothat when the device is in use the tool will be securely held in the socket member.

On both sides of the key slot 8 the socket member 3 is provided with boltholes 12 to accommodate the leg portions of a ill-bolt 13, said bolt holes communicating at their inner sides with the socket 5, and the bushing 6 being provided with notches 14L adapted to be engaged by the U-bolt when the bushing and U-bolt are in place. assists in preventing the bushing 6 from be} ing withdrawn from the socket 5.

Thus the U-bolt Inserted between the key 10. and the intermediate portion of the U-bolt 13" is a wedge 15 contacting the outer face of the key 10 so as to hold said key firmly in place.

The socket member 3 is provided on both sides of the wedge 15'and key 10 with abutments in the form of lugs 16 of somewhat greater height than the thickness of the wedge 15, said lugs having curved faces 17 forming seats to engage the leg portions of the U-bolt adjacent the intermediate portion 1 of said U-bolt. The lugs 17 thus form a channel 18therebetween to accommodate the wedge 15. The purpose of the lugs 17 is to prevent the U-bolt from being bent when the wedge 15 is being driven in place to hold 1 the key against the drill-bit 7 for," without said lugs, the U-bolt'would tend to be bent at the face of the socket -member3 where the intermediate portion of the U-bolt projects The U-bolt 13is provided with the usual nuts 19 which have cylindrical portions 20 to engage counterbores 21. i

i In practice, to remove the drill-bit 7 from the device, the. wedge 15 will be knocked loose to relieve the pressure on the key 10 so as to free the drill-bit. In inserting the drill bit in the socket member, said drill-bit will be pushed into the bushing 6 and then the Wedge 15 Will be driven tightly into place between the key 10 and the intermediate portion of the U-bolt. During the driving in of the Wedge 15 the lugs 16 function to prevent the U-bolt from being bent so that the Wedge can be driven much tighter than if the U-bolt Were allowed to bend with it When it is being driven- Thus it is clear, that the'device, though comparatively simple, is very useful in insuring that the drill-bit 7 be tightly held in the socket member and that the U-boltbe maintained in good condition for that purpose. I

I claim: 1 p p 1. In combination, a socket member having a key slot, a tool in the socket member, a key in the, slot engaging the tool, lugs on the socket member at both sides of the key,

a U-bolt passing through the socket mem- Copies of this patent may be obtained for between the key and intermediate portion of the U-bolt.

2. In combination, a socket member having a channel, a tool in the socket member, a key'to hold said tool in place, a U-bolt projecting from the socket member astride of said channel, the material forming the sides of the channel engaging and preventing bending of the U-bolt and a Wedge accommodated in said channel between the keyand U-bolt.

3. In combination, a socket member, a tool in the socket member, a U-bolt projecting from the socket member, means including a Wedge retained by the U-bolt to hold the tool in place, and means to prevent bending of the U-bolt When the Wedge is'being driven in. i

Signed at Los Angeles, California, this 7th day of August, 1916.

7 CHARLES A. HULTQUIST.

Witnesses:

GEORGE H. HILEs, ANNA F. SQHMIDTBAUER.

five cents each, byaddressing the Commissioner of Patents.

Washington, D. 0. 

